Upon occasion, my phone won't update due to insufficient space on the root partition. There are plenty of videos out there that show you how to download more crap on to the phone. My problem is that you can't. There is insufficient space!

A quick remedy that doesn't involve rooting your phone, plugging in a USB cord to a secondary computer and altering archaic folders, or even worse, attempting to do so via a terminal on your phone is to dial...

*#9900#

Which brings up the SysDump screen. Select "Delete dumpstate/logcat" Press "OK" in the resulting window, then scroll to the bottom of the SysDump screen and select 'Exit'

This should certainly free up some space! Works fine on my old-skool cool GT-I9100M running 4.1.2